/*	Interactive Gravitational Simulator
	Project: IGS Core
	File: Snapshot.h
	Author: Mike Bantegui <mbante2@gmail.com>, Hofstra University 
	Copyright (C) 2012 - 2013 Mike Bantegui

	This file is part of the IGS software package for simulating
	the N-Body problem in real-time. This was developed as part
	of a departmental honors thesis project at Hofstra University
	in the Spring 2012 semester.

	IGS is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	IGS is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#ifndef IGS_SNAPSHOT_H
#define IGS_SNAPSHOT_H

#include "Dynamics.h"
#include <vector>

namespace IGS
{

struct Body;
struct PhasePoint;
struct ViewNode;

// Represents a slice of the NBodySystem at
// a single instant in time
class Snapshot
{
private:
	// The points within this system
	PhasePoint *Bodies;
	// The size of the system
	const int N;
	// The total mass of the system
	const double _Mass;
	// The dynamical properties of the system
	const Dynamics _Dynamics;
	// The tree structure for this system
	const std::shared_ptr<ViewNode> _Tree;

public:
	Snapshot(const Body *bodies, const int n, const double mass, const Dynamics &dynamics, const std::shared_ptr<ViewNode> tree);
	~Snapshot();
	
	const std::shared_ptr<ViewNode> Tree() const;

	const double KineticEnergy() const;
	const double PotentialEnergy() const;
	const double TotalEnergy() const;

	const double MaxDistance() const;
	const double MaxVelocity() const;
	const double MaxMomentum() const;

	const double MaxMass() const;

	const Vector CenterOfMass() const;
	const Vector CenterOfMomentum() const;

	const Vector AngularMomentum() const;
	const Vector AngularVelocity() const;
	const Vector TotalForce() const;

	const Vector MinBound() const;
	const Vector MaxBound() const;

	const int Size() const;
	const double Mass() const;
	const PhasePoint &operator[](const int i) const;
};

}

#endif